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All Journal Jurnal Kimia (Journal of Chemistry) Eksergi Media Farmasi Indonesia
Nanik Wijayanti
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Immunology & microbiology Medicine & Pharmacology Other

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SPESIASI DAN BIOAVAILABILITAS LOGAM BERAT TIMBAL (Pb) DAN TEMBAGA (Cu) DALAM SEDIMEN SUNGAI TUKAD BADUNG Nanik Wijayanti; I Made Siaka; Ida Ayu Gede Widihati
Jurnal Kimia (Journal of Chemistry) Vol. 9, No. 2 Juli 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (72.332 KB) | DOI: 10.24843/JCHEM.2015.v09.i02.p11

Abstract

A study of speciation and bioavailability of heavy metals, Pb and Cu in sediments of Tukad Badung river with sequential extraction method has been carried out. This study aimed to determine the levels of bioavailability of both Pb and Cu heavy metals. The determination of total heavy metal contents was performed by digestion technique with the use of a mixture of HNO3 and HCl (3:1) in ultrasonic bath for 45 minutes at 60oC followed by heating on a hotplate for 45 minutes at 140oC. The mesurement of total heavy metals and heavy metal species was established with the use of Atomic Absorption Spectrophotometer (AAS) with calibration curve method. Concentration of total Pb and Cu in the sediments of Tukad Badung river ranged from 4.2669 to 27.9171 mg/kg and 20.5240 to 69.3782 mg/kg respectively. The speciation of Pb obtained in carbonate fraction of the EFLE (easly, freely, leachable and exchangable) fractions ranged from 1.5952-11.6315 mg/kg, in Fe/Mn oxide fraction ranged from 0.4001 to 6.7680 mg/kg, in organic/sulfide fraction ranged from 0.8759 to 13.6600 mg/kg, and in the silicate fraction (resistant) ranged between Nd (not detected) to 4.6598 mg/kg. The level of bioavailability Pb in sediments ranged from 9 to70% while the non-bioavailability levels ranged from 0 to 30%. Carbonate fraction (EFLE) of Cu ranged between Nd (not detected) to 6.3527 mg/kg. The fraction of  Fe/Mn oxides ranged from 0.7331 to 9.9033 mg/kg, organic sulfide fraction ranged from 8.1790 to 41.5756 mg/kg, and the silicate fraction was foud vary between 7.5138 and 21.0200 mg/kg. The level of Cu bioavailability in sediments ranged from Nd (not detectable) to 18%, while the level of non bioavailability ranged from 15 to 44%.
AKTIVITAS ANTIRADIKAL BEBAS β-KAROTEN PADA EKSTRAK UBI JALAR (Ipomoea batatas Lamk.) DENGAN METODE DPPH (1,1-DIFENIL-2-PIKRILHIDRAZIL) IN VITRO A.A. Hesti Wulan S; Fitri Haryanti; Nanik Wijayanti
Media Farmasi Indonesia Vol. 6 No. 1 (2011): Media Farmasi Indonesia
Publisher : SEKOLAH TINGGI ILMU FARMASI YAYASAN PHARMASI SEMARANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.477 KB)

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Sweet potato, especially orange sweet potato, contains β-carotene. The content of β-carotene in orange sweet potato is 86,46 mg/100 mg, which is more than that in the white, purple and yellow sweet potato. β-carotene has the potency as a free antiradical and anticancer. Free antiradical are compounds which have the ability to inhibit oxidation reaction and prevent free radical, so that they can protect human body from degenerative diseases like cancer, coronary heart, and diabetes mellitus. The activity of free antiradical test was conducted by DPPH (1,1-difenil-2-pikrilhidrazil) methods at the wave length of 516 nm. The sample of β-carotene extract which had been thickened, was diluted in 10.0 ml methanol. The test of free antiradical was done by adding the volume of sample 0.2 ml; 1.0 ml; 2.0 ml; 3.0 ml and 3.8 ml into DPPH solution. As comparasion, vitamin E was prepared by dissolving 0.5 g substance in 25.0 ml methanol. Then, series of concentration 0.01%; 0.02%; 0.04%; 0.06% and 0.08% was made. The activity was measured in the percentage of muting free radical DPPH in thirty minutes. The data of the determination result of β-carotene free antiradical was evaluated its value of EC20 and compared to the value of EC20 in vitamin E. Based on the result, the research shows that the value of EC20 β-carotene in sweet potato extract is 402.4343 μg/ml, while that in vitamin E is 2.6299 μg/ml. Therefore, it can be concluded that β-carotene in sweet potato extract has lower activity of free antiradical than in vitamin E.
Pemanfaatan Cangkang Bekicot sebagai Koagulan Alternatif untuk Meningkatkan Kualitas Air Sungai Code Tunjung Wahyu Widayati; Dyah Tri Retno; Nanik Wijayanti
Eksergi Vol 9, No 1 (2009): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7586

Abstract

Pemanfaatan Cangkang Bekicot sebagai Koagulan Alternatif untuk Meningkatkan Kualitas Air Sungai Code
Co-Authors A.A. Hesti Wulan S Dyah Tri Retno I Made Siaka I. A. Gede Widihati Jamhari Jamhari Tunjung Wahyu Widayati